U.S. Forest Service Chief Tom Tidwell recently traveled to Philadelphia — city of many street trees — to unveil a new version of the service's i-Tree software. Not quite an app — but the same idea — it helps both planners and regular citizens assess the monetary value of the street trees, plus quantify the environmental services the trees provide. It fact...

Denver Parks and Recreation and the Mile High Million conducted an iTree study in 2008 with the help of volunteers and we found that the street trees in Denver provide an estimated $39,000,000 worth or benefits to the community each year!